sountouch.recipe: Fix symbol export on MSVC

Part-of: <https://gitlab.freedesktop.org/gstreamer/cerbero/-/merge_requests/1355>

2 files changed, 58 insertions, 3 deletions

diff --git a/recipes/soundtouch.recipe b/recipes/soundtouch.recipe
index aafdd744..73eba44d 100644
--- a/recipes/soundtouch.recipe
+++ b/recipes/soundtouch.recipe
@@ -15,14 +15,12 @@ class Recipe(recipe.Recipe):
                'soundtouch/0008-Fix-compilation-with-clang.patch',
                'soundtouch/0001-Add-minimal-meson-build-system.patch',
                'soundtouch/0002-add-support-for-linking-with-gnustl-on-android.patch',
+               'soundtouch/0001-Export-symbols-for-a-DLL-correctly.patch',
               ]
 
     files_libs = ['libSoundTouch']
     files_devel = ['include/soundtouch', 'lib/pkgconfig/soundtouch.pc']
 
-    # FIXME: Meson port does not export symbols correctly for use with MSVC
-    can_msvc = False
-
     def prepare (self):
       if self.config.target_platform == Platform.ANDROID:
         self.append_env('CXXFLAGS', '-fexceptions -DST_NO_EXCEPTION_HANDLING')
diff --git a/recipes/soundtouch/0001-Export-symbols-for-a-DLL-correctly.patch b/recipes/soundtouch/0001-Export-symbols-for-a-DLL-correctly.patch
new file mode 100644
index 00000000..69d6d8c5
--- /dev/null
+++ b/recipes/soundtouch/0001-Export-symbols-for-a-DLL-correctly.patch
@@ -0,0 +1,57 @@
+From 0f852e729589851edf75d31100ea8cdff19986e4 Mon Sep 17 00:00:00 2001
+From: Nirbheek Chauhan <nirbheek@centricular.com>
+Date: Thu, 8 Feb 2024 08:48:19 +0530
+Subject: [PATCH] Export symbols for a DLL correctly
+
+Fixes the MSVC build, which requires this. GCC (MinGW/Autotools)
+simply exports everything.
+---
+ include/SoundTouch.h          | 11 +++++++++++
+ source/SoundTouch/meson.build |  6 ++++++
+ 2 files changed, 17 insertions(+)
+
+diff --git a/include/SoundTouch.h b/include/SoundTouch.h
+index f2addc1..e02f559 100644
+--- a/include/SoundTouch.h
++++ b/include/SoundTouch.h
+@@ -164,7 +164,18 @@ namespace soundtouch
+ ///   tempo/pitch/rate/samplerate settings.

+ #define SETTING_INITIAL_LATENCY             8

+ 

++#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(SOUNDTOUCH_STATIC_COMPILATION)

++    #ifdef DLL_EXPORTS

++        #define SOUNDTOUCH_API __declspec(dllexport)

++    #else

++        #define SOUNDTOUCH_API __declspec(dllimport)

++    #endif

++#else

++    #define SOUNDTOUCH_API

++#endif

++

+ 

++SOUNDTOUCH_API

+ class SoundTouch : public FIFOProcessor

+ {

+ private:

+diff --git a/source/SoundTouch/meson.build b/source/SoundTouch/meson.build
+index 9bfcf96..2826165 100644
+--- a/source/SoundTouch/meson.build
++++ b/source/SoundTouch/meson.build
+@@ -52,8 +52,14 @@ extra_libs += [
+   )
+ ]
+ 
++exports_arg = []
++if host_machine.system() == 'windows' and get_option('default_library') != 'static'
++  exports_args = ['-DDLL_EXPORTS']
++endif
++
+ libsoundtouch = library('SoundTouch',
+     soundtouch_sources,
++    cpp_args: exports_arg,
+     link_with: extra_libs,
+     version: libversion,
+     soversion: soversion,
+-- 
+2.41.0
+